try "../" im not sure but that goes up one directory so it depends on who knows what. I think that is what your looking for but im not sure if it will work for this
(NOTE: It can be used multiple times! I.E. www.sub.site.com/../../../)
so then it would most likely be javascript:history-1
LOL idk that one though
FOUND IT
<A HREF="javascript:history.go(-1)">[text]</A>
FOUND IT
<A HREF="javascript:history.go(-1)">[text]</A>